#!/usr/bin/python3

import os
import re
import sys
import subprocess

if (len(sys.argv) < 3):
	print("Usage: %s [binary] [log]" % (sys.argv[0]))
	sys.exit(1)

binary = sys.argv[1]
count = 0
frames = []
addrs = []

log_file = open(sys.argv[2], 'r')

# Extract addresses
for line in log_file:
	matchobj = re.compile(r'\[(0x[0-9a-f]+)\]$').search(line)
	if matchobj:
		addrs.append(matchobj.group(1))

log_file.close()

# Feed into addr2line
command = ['addr2line', '--demangle', '--functions', '--basename',
							'-e', binary]
command.extend(addrs)

p = subprocess.Popen(command, shell=False, bufsize=0,
		stdin=subprocess.PIPE, stdout=subprocess.PIPE, close_fds=True)
(child_stdin, child_stdout) = (p.stdin, p.stdout)

child_stdin.close()

# Backtrace display
for line in child_stdout:

	if line.startswith("??"):
		continue

	line = line.strip()

	frames.append(line)

child_stdout.close()

frame_count = len(frames);

count = 0
print("-------- backtrace --------")
while count < frame_count:
	print("[%d]: %s() [%s]" % (count/2, frames[count], frames[count + 1]))
	count = count + 2
print("---------------------------")
